Method and apparatus for detecting gas components in oil in oil-filled device

Abstract

In an apparatus for detecting gas components in the oil in an oil-filled device, which comprises a gas-storing chamber being provided at an oil-filled device containing an insulating oil through a gas-permeating material capable of separating gas components from the insulating oil, a gas calibration tube being provided at the gas-storing chamber through a switch valve, and a gas chromatographic device connected to the gas calibration tube through the switch valve, any influence of gas components in a subatmospheric pressure is eliminated and exact concentrations of gas components are detected by providing at least one stirring mixer having at least one throttle perforation in a carrier gas passage for supplying the gas components from the gas calibration tube to the gas chromatographic device at the upstream side of a gas separation column of the gas chromatographic device, or by proving a circulation passage between the gas-storing chamber and the gas calibration tube, a valve capable of being exposed to the atmosphere at the circulation passage, and a gas circulation unit at the circulation passage for circulating the gas in the circulation passage.

What is claimed is: 
     
       1. A method for detecting gas components in the oil in an oil-filled device, which comprises separating gas components dissolved in an insulating oil in an oil-filled device through a gas-permeating material, storing the separated gas components in a gas calibration tube through a switch valve, and detecting the gas components stored in the gas calibration tube by a gas chromatographic device, wherein an improvement comprises pushing the gas components separated from the insulating oil and stored in the gas calibration tube in advance off from the gas calibration tube by a carrier gas, and mixing the gas components by stirring before the detection in the gas chromatographic device. 
     
     
       2. A method for detecting gas components in the oil in an oil-filled device, which comprises separating gas components dissolved in an insulating oil in an oil-filled device through a gas-permeating material, storing the separated gas components in a gas calibration tube through a switch valve, and detecting the gas components stored in the gas calibration tube by a gas chromatographic device, wherein an improvement comprises storing the gas components separated from the insulating oil in a gas-storing chamber, exposing the gas-storing chamber to the atmosphere, thereby bringing the gas-storing chamber into the normal pressure, circulating the gas under the normal pressure between the gas-storing chamber and the gas calibration tube, and then supplying the gas in the gas calibration tube to the gas chromatographic device. 
     
     
       3. The method according to claim 1 or 2, wherein the gas components stored in the gas-storing chamber is under a subatmospheric pressure. 
     
     
       4. An apparatus for detecting gas components in the oil in an oil-filled device, which comprises a gas-storing chamber being proviced at an oil-filled device containing an insulating oil through a gas-permeating material capable of separating gas components from the insulating oil, a gas calibration tube being proviced at the gas-storing chamber through a switch valve, and a gas chromatographic device connected to the gas calibration tube through the switch valve, wherein an improvement comprises at least one stirring mixer having at least one throttle perforation being provided in a carrier gas passage for supplying the gas components from the gas calibration tube to the gas chromatographic device at the upstream side of a gas separation column of the gas chromatographic device. 
     
     
       5. The apparatus according to claim 4, wherein the stirring mixture has a gas impingement plate at the downstream side of the throttle perforation. 
     
     
       6. An apparatus for detecting gas components in the oil in an oil-filled device, which comprises a gas-storing chamber being provided at an oil-filled device containing an insulating oil through a gas-permeating material capable of separating gas components from the insulating oil, a gas calibration tube being provided at the gas-storing chamber through a switch valve, and a gas chromatographic device connected to the gas calibration tube through the switch valve, wherein an improvement comprises a circulation passage being provided between the gas-storing chamber and the gas calibration tube, a valve capable of being exposed to the atmosphere being provided at the circulation passage, and a gas circulation unit being provided at the circulation passage for circulating the gas in the circulation passage.